HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>background-size: 50%</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

    p {
      margin: 0 0 12px;
      max-width: 40rem;
      line-height: 1.5;
    }

    div {
      height: 160px;
      padding: 16px;
      color: #fff;
      background-color: #0f172a;
      background-image: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' width='120' height='80'><rect width='120' height='80' fill='%231d4ed8'/><circle cx='60' cy='40' r='28' fill='%2338bdf8'/></svg>");
      background-repeat: no-repeat;
      background-position: center;
      background-size: 50%;
    }
  </style>
</head>
<body>
  <p><strong>50%</strong> sets the width. Height stays <strong>auto</strong>, so the ratio is kept.</p>
  <div>Scaled image</div>
</body>
</html>

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CSS background-size Property — 50%